Molding press



Nov. 3, 1925- 1,560,117

' F. E. STEVENSON ET AL MOLDING PRESS Filed Sept. 25. 1924 "rshets-Sheet l ,fiivrdibn a mil-42550 '6 Nov. 3, 1925. 1,560,117

F. E. STEVENSON ET AL' MOLDING PRESS Filed Sept. 23. 1924 '1sheets-$11361. 2

Nov. 3, 1925. v 1,560,117.

F. E. STEVENSON ET AL MOLDINIGAPRESS Filed Sept. 1924 1 '7 Sheets-Sheet3 The s fldsbevemmi Nov. 3, 1925.

F E, STEIVEN'ISON ET AL I MOLDING PRESS v sheets-sheet 4 Filed Sept. 23,1924 v 1,560,117 A F.v E. STEVENSON ET AL MOLDING mass Filed Sept, 23.1924 7 Sheets-Sheet 5 i iweniors EEJS EeUeRGOIo Qyi'heirAtEm-ngys Nov.3, 1925.

.F. E. sTsvE NsdN ET AL MOLDiNG PRESS 'r Shets-Sheet 6 lllll 8 Rm m-Patented Nov. 3, 1925.

y 1,s60-,117Y UNITED STATES PATENT OFFICE.

FRANCIS E. STEIENSON AND THOMAS F. STACY, OF MOUNT GILEAD, OHIO,ASSIGNOBS TO THE HYDRAULIC PRESS MANUFACTURING COMPANY, OF MOUNT GILEAD,OHIO.

MOLDING PRESS.

Applicationflled September 23, 1924. Serial No. 739,303.

To all whom it may concern Be it known that we, FRANCIS E. STEVEN- SONand THOMAS F. STACY, citizens of the United States, and residents ofMount Gilead, in the county of Morrow and State of Ohio, have inventedcertain new and useful Improvements in Molding Presses, of which thefollowing is a. speclfication.

This invention relates particularly to a press for molding of henoliccondensation products, pyrolic'con ensation compoimds, or for similarmaterials which require substantially the same treatment. It is intend-'ed to be equipped with steam and water pipes and to perform work wherehot mold ing alone is necessary, or where the mold 1s afterwardschilled. It may also be used for cold molding.

There is provided an inverted main cylinder which moves a platen andoperates at 3000 pounds per square inch pressure. A tilting head iscarried by the main platen and is-adapted to swing through 120 fromoperating position to afford easy access vided with T-slots for thelowermolds.

These-are also heated or chilled as. desired by steam or water suppliedthrough telescoping connections.

Special means are provided for controlling the tilting movements of: thetilting head. A kick-out arrangement for the lower bed is controlled bythe upward movement.

of the upper platen, and a foot pedal is rovided for releasing thekick-out rods w ich are returned by spring actuated means. The tiltinghead is also provided with automatic ejector mechanism, two forms ofwhich are disclosed in the application.

Various other detail features form apart thereto. Thetilting head isprovided with T-slots for attaching the molds, and adjustable stops areemployed to limit the upward movement of the platen at any desiredcylinder, whi e auxiliar auxiliary cylinders 11, evejextended'endspassing through guides 12andare connected of the invention, which isdescribed in the follow-mg description and covered bythe appendedclaims.

Inthe drawings:

Figure 1 is a front elevationof the press with the upper platen at theupper limit of its mgvement and the tilting head in tilted posit on. f

Figure 2 is a sectional somewhat diagrammatic' view of one of the valveswhich control thevarious steps of the operation.

Fi ure 3 is a side elevation with the parts in the positions cori'es'nding to Figure 1.

Figure 4 is a side e evation of. a. 'part'of the press, showing thetilting head moved back to operative position.

Figure 5 is a front elevation of theupper platen with the tilting headin operative sition, corresponding toFigure 4. j

Figurefi is a. side elevation of the tilting head in tilted.positiongshowing one form of ejector mechanism. Figure 7 is a sideelevation of the lower sliding table moved outward to inoperativeposition. L

Figure 8 is a. frontelevation of the lower tableshowing a portion of theejector mech- I Figure 11 is a similar view showing the head incompletelytilted position.

Figure 12 is a section on thdline 12-12 of Figure 11.-

the main 'frame 3 connected by four strain rods 4 with the upper portion5 which carries the main cylinder .6 and auxiliary cylinders 7 castintegral therewith. A main As illustrated the press comprisesfrontsupports 1" and rear supports 2 which sup' ram 8 carryin a platen9-works intho main rams 10 work in to the mechanism for tilting-thehead, hereinsfter deseribed. These lidesform cross fu' erfunctions'hereinafterdescribed; The platen!) has lugs least the whichserve-to limit the upward movement sliding on the strain rods and haveof the platen by contact with stop rods 14 which are screwed into lugs15 cast on the main cylinder 6. The rods are held in adjusted positionby nuts 16. i

Carried by the platen 9 is a tilting head 17 provided with T-shapedgrooves 18 which receive the molds. This head is provided with trunnions19 which are pivotally mounted in depending side portions 20 of theplaten 9 so that the head can be rotated from a position as shown inFigures 4 and 5 in which the face thereof is in a horizontal plane andthe molds are in pressing position, to the position shown in Figures 1,3 and (5 in which it has been rotated through approximately 120. Thisoperation is accomplished in the following manner.

Carried by the outer end of each trunnion 19 is a crank arm 21, theouter end of whichhas a bolt or pin 22 working in a slot 23 in a shortcross Head 24 carried .by the ram 10. Obviously as the rods or rams 10are moved by pressure in the auxiliary cylinders 11, the crank arms 21will cause the tilting head to turn onthe trunnions 19. This movement isor may be entirely independent of the "ertical movement of the mainplaten and preferably takes place before and after the movementsthereof.

Since probably a large number of the molding pieces will stick in themolds of the tilting head it is advisable to provide some automaticmeans for ejecting thesame. In the form of Figures 1 to 6 inclusive,this is carried out in the following manner. A frame or yoke 25 ismounted to slide in guides at' each side of the tilting head 17 and ismachined at two points on the inside thereof as shown at 26- to fiteccentrics 27 rigidly carried by the platen 9. As the tilting headrotates about the stationary eccentrics these will cause a slidingmovement of the frames 25 at the sides of the tilting head into theposition shown in Figure 6. Cross bars may be provided to connect theseframes and these may carry the mold pins so that they will moveoutwardly and eject the pieces. A reverse rotation of the tilting headwill obviously withdraw the frames 25 to a position in which they do notproject beyond the face of the tilting head.

Adjustable stops 28 may limit the tilting movement in each direction.For the purpose of supplying steam or water or both to the tilting head,passages 29 are provided which pass through the trunnions and may beconnected to flexible pipes as desired.

The lower press bed 3 supports a sliding table 30 which is guided ontracks 31. Attached thereto is a hydraulic cylinder 32 of the usual typeof double acting hydraulic cylinders, the piston rod 33 of which has twopassages 34 and 35 therethrongh, one

permitting the flow to one side of the piston head and the other to theopposite side.

This is a construction familiar to those the sides of the table whichtelescope on the pipes 36 as the table moves back and forth. Thesecylinders 37 have pipes 38 connected thereto. Rods 39 pass through andare fixed to the base and are provided at their ends with adjustablenuts 40 by which the movement of the sliding table in each direction maybe limited.

There is also provided automatic ejector mechanism for the lower mold onthe slid-- ing table 30 which will now be described.

.Rods 41 extending downward from the platen9 support the cross head orguide 12 and to this is connected :1 rod 42 which passes through asleeve 43 which limits the movement of the cross head 12 in onedirection. This construction is duplicated at each side of the press andthe rods 42 are attached at their lower ends to a yoke 44'.

.Springs 45 interposed betwen the yoke and the press bed'tend to morethe cross head 12, rods 42 and yoke 44 downwardly. Rigidly carried bythe yoke 44 are pins 46 which operate to raise a second yoke 47 throughthe interposition of sliding bars 48 which slide in guides 49 in saidyoke 47. These bars have holes large enough to permit the passage of thepins 46 when said holes are in line therewith. The yoke 47 is providedwith upwardly extending rods 50 which are fast at their upper-ends tobars 51 which are operated in slots- 52 under the sliding table. Thesliding bars 48 are connected by links 53 to a rock shaft 54 which has acrank arm 55 connected by a link 56 to a foot lever or pedal 57 normallyheld in raised position by a spring (not shown). When the pedal is up,the bars 48 are in such position that the pins 46 do not register withthe holes. and therefore when the upper platen is raised, carrying withit the rods 42, the yoke 44 and pins 46 will rise, and the pins willlift. the bars 48 and consequently the yoke 47. which ill-turn lifts therods 50 and the bars 51. Any molds which may be attached to theftablc 30are provided with pins (not shown) which rest on the bars 51.Consequently the above described upward movement of the parts will raisethese pins and eject'the pieces from the mold-so that the operator canlift them oil. This can be done wit-h the sliding table .the parts shownin- Figure 8. The pedal spring then causes only a slight shearing actionon the pins 46 and consequently the pedal does not rise.

However, when the upper press head again moves downward, the rods 42will descend with the yoke 44 and the pins 46. Since 7 the rods 50 arefast to the bars 51 and these cannot move downward any farther thanshown in Fi ure 8, the pins 46 are withdrawn from the liars 48 and afterthey disengage the same, the pedal spring again operates to raise thepedal and slide the bars 48 endwise until the holes therein no longerregister with the pins-46. The parts are again in position for automaticejection of the pieces upon the next upward movement of the upper presshead or platen.

The varioussteps of the operation are timed by means of a seriesof'valves which i may beoperated either manually or automatically. Oneof these valves is shown diagrammatically in Figure 2, and comprises avalve 58 having a silding stem 59 spring urged in one direction andcontrolling inle} and outlet pipes 60 and 61. Each valve is operated bymeans of a horizontal lever 62 pivoted at 63 on a rod and having aprojection 64 operated by a cam 65 on a shaft 66 that may be driven asdesired. Each cam segment is removab e and when setting up a'new set ofmolds, the valves are operated by handles '67 on the levers until theproper timing is determined, when a set of cam segments will be.constructed adapted for that particular work and these will beconsidered a part of -the mold equipment. The whole automatic featuremay be thrown out of operation by a lever 68 at the right of the set ofvalves. The exact arrangement of these valves and ofthe connections tothe various hydraulic cylinders of the fluid pipes has not beenillustrated since similar arrangements are old and this in itself formsno part of the invention. The operation may be entirely manual, ent relyautomatic, or partly manual and partly automatic, as the character ofthe work may render desirable.

Figures 10, 11 and 12 disclose a modified form for the ejection of thepieces from the upper mold. The mechanism for moving vice, the frames oryokes 25 are in their most extended position when the tilting head hasmoved through an angle of 120 from its operative. position. In themodified construction, these yokes reach their most extended posit-ionwhen the head "has been tilted through an angle of about- 60, and as thetilting movement continues, they are retracted until they are flush withthe pressing surface of the tilting head when *it has reached the end ofits tilting movement. Moreover, on the return movement,' thes yokesremain stationary with respect to the tilting head. I This operation isbrought about by the following constructiom The frames or yokes 69 areguided in grooves 70 similar to'the first form, and each yoke fits overa cam plate 71 of approximately triangular shape and having threeengaging points 72. When the head is in fully tilted position or invnormal operative position, one of the points 72 is in engagement with afiat portion 73 on the yoke. and holds it in its retracted position.-When the head begins to tilt from normal pressing position, the camplates 71.are held in fixed position so that the yokes 69 are compelledto slide outwardly until the head has turned through about 60, afterwhich the yokes are retracted again throu h the next 60 of rotation ofthe head. n the return movement from fully tilted to pressing position,the cam plates 71 turn with the head, and consequently no motion isimparted to the yokes 69.

Each of the cam, plates is associated with two ratchet plates 74 and75,of which the plate 74 is fastened to the tilting head 17 by pins 7 6,while the plate 75 is fastened to the arm 20 of the main platen by pins77. The ratchet plate 74 therefore always revolves with the tilting head17, while the ratchet plate 75 never revolves. The trunbut is connectedto neither. As clearly shown at Figures 10 and 11, thecam plates areslotted at each corner as at 78. In the slots are placed two pawls-7 9and80 Which are normally pressed outwardly by the springs 81 andcooperate with notches 82 1n the cam plates 74 and 75 respectively. Whenthe head starts to revolve from pressing position, the cam plates 71 areheld stationary by means of the pawls 80 which engage in notches in theedge of the stationary ratchet plate 75. However, the ratchet plate 74which is fast to the head 17 revolves. and causes the pawls '79 to yieldagainst the force of the springs 81. After the head has revolved through120 the pawls 79 again engage notches in the edge of the plate 74. Butwhen the head revolves 1n the opposite direction toward pressingposition, the plate 74 revolves therewith and the pawls 79 carry thecams 71 and cause them to revolve with the head 17 During this motionthe pawls 8O recede against the force of their springs 81. Since the camplates revolve with the head at this time, there is no tendency to forcethe yokes 69 outward, in fact, they are restrained against suchmovement.I

It is thought that the operation of the device will be clear from theabove description, but it may be briefly recapitulated. Assuming that apressing operation has just been completed, pressure is admitted yoke 44and through the mechanism already described, eject the pieces from thelower mold, whether the table is in its normal or outer position. Thistable is moved outwardly either simultaneously with the rise of theupper platen or subsequent thereto. The ejecting mechanism havingoperated, the pedal 57 is operated, permitting the mechanism to move toa point where it will again be set upon reverse movement of the upperplaten. Before pressure is admitted into the main cylinder to move theup er] platen downwardly, the auxiliary eylin ers 11 must raise the rods10 to rotate the tilting head to pressing position. All of theseoperations may be automatic and timed by the rotation of the cam shaft66, or they mayjbe manually controlled by the levers 62. They may alsobe partly automatic and partly manual. uch valve mechanism controlled bycams on a rotating shaft is old and commo n and has not been illustratednor described in detail. -The various inlet .andoutlet pipes for steamand water have also not been shown n full, since these fea tures inthemselves constitute no part of the invention. 1 c

It is obvious that many details oh the structure herein illustrated anddescribed may be varid without in any way departng from the spirit ofthe invention, which is to be regarded as limited only by the scope ofthe appended claims.

\Ve claim as our invention: 1'

1. A molding press comprising an upper press member including a platen,means for reciprocating said platen to and from pressing position, meansfor limiting the movement of the platen to a" straightline, a moldcarrying headcarried by said platen, and means for tilting said headindependent of the movement of the platen.

2. A molding prem comprising a press mal position. t

10. A molding press comprising upper position.

3. A molding press comprising a platen having a direct line movementonly, a mold supporting member pivotally carried by said platen, andmeans for oscillating said member independent of the straight linemovement of the platen.

4. A molding press comprising a mold supporting member, hydraulic meansfor giving said member movement to and from pressing position, andhydraulic means automatically operable for oscillating said member tobring the operative face thereof to readily accessible position.

5. A molding press comprising a press member movable only in a straightline to and from operative position, a head pivotally carried thereby,means for imparting pivotal movement to said head, and an automaticejecting device carried by said head.

6. A molding press comprising a press member movable to and fromoperative positlon, a head pivotally carried thereby, means forimparting pivotal movement to the head, and an automatic ejecting deviceoperated -by said pivotal movement of the head. A 7. A molding presscomprising-a press member inov able to and from operative osition, ahead pivotally carried. there y, means -for imparting pivotal movementto the head, an ejecting device, and cam means operated by the pivotalmovement of the head for actuating'said ejecting device.

8. In a molding press having a press member comprising a tilting head,means'for tilting said head, an ejecting device, means for projectingthe ejecting device during a portion of the tiltingvmo vement andreturning it to inactive position during the remainder ofthe tilting"movement.

9. In a molding press having a press member comprising a headandmeansfor moving said head through an are from normal to tilted position;an ejectingdcvice, means for projecting said device 'while the headmoves through a portion; of the arc from normal to tilted position andreturning it to inactive position during the remainder of the. tiltingmovement, and means whereby the ejecting device does not operate duringthe movement of the head from tilted to norand lower press members,means for moving the upper member towards and from the lower, anejecting device for the lower member operated by the movement of theupper away therefrom, andmeans whereby; the

movement of the upper member towards the upper member towards the lower,means for sliding the lower member into and out of pressing position,and an ejecting device for the lower member operated by the movement ofthe upper away therefrom regardless of whether the lower member is inits inner. or

outer position.

12. A molding press comprising twopress members, means for moving saidpress members in directions at an angle to each other to and from theirpressing positions, and an ejecting device for one member operated bythe movement of the other away from pressing positionregardles's of therelative position of the first member.

13. A'molding press comprising two press members, means for moving saidpress members in directions at an angle-to each other to and from theirpressing positions, an ejecting device for one member operated by themovement of the other member from pressing position regardless of therelative position of the first member, and means for releasingsaidejecting device atwill.

1-1. A molding press comprising two press members one of which has amovement toward and from the second, and the second of which has asliding movement into and out of pressing position, an ejecting devicefor the second member, means for operating the same by the movement ofthe first away from the second regardless of the sliding movementthereof, and an independent ejecting device for the first member.

15. A hydraulic molding press comprising an inverted platen, means forgiving the same right line movement, a tilting head supported ontrunnions carried by said platen, means for tilting said head, anejecting device therefor; and cam means associated with said trunnionsfor operating the ejecting device by the tilting movement.

16: A molding press comprising a tilting head, an ejecting devicetherefor, means for tilting said head through about 120, and means foroperating said ejecting device during the first half ofthe tiltingmove-' ment and returning it to normal position during the second halfthereof.

In testimony whereof, we have'hereunto subscribed our names.

FRANCIS E. STEVENSON. I THOMAS P. STACY.

